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The morphologic characteristics of the distolingual roots of mandibular first molars in a Taiwanese population.
J Endod 2009; 35(5):643-5JE

Abstract

INTRODUCTION

The prevalence of extra distolingual (DL) roots in mandibular first molars in Chinese population is about 20%. The purpose of this study was to evaluate the difference of root length and root curvatures between distobuccal (DB) and DL roots of three-rooted mandibular first molars in a Taiwanese (Chinese) population.

METHODS

Of the 293 extracted mandibular first molars, DL roots were present in 29 (9.9%) teeth. Excluding teeth with fractured DB or DL roots, 21 mandibular first molars were further investigated. DB and DL root lengths were measured from the lower level of furcation at the distal surface to the root apex. The curvature of the DL root was measured on mesial-distal and buccal-lingual radiographs by Schneider's technique.

RESULTS

The DL roots were significantly (p < 0.001) shorter than the DB roots with an average of 1.48 +/- 0.81 mm. Most DL roots had a greater curvature in a buccal-lingual orientation (36.35 degrees +/- 9.38 degrees) than a mesial-distal orientation (9.24 degrees +/- 6.10 degrees) and 28.57% of the curved DL roots had the curvature at the apical one third (p < 0.001).

CONCLUSION

The results of this study verified the characteristics of shorter root length and severe buccal-lingual inclination of DL roots in three-rooted mandibular first molars.

Authors+Show Affiliations

Department of Stomatology, Division of Endodontics and Periodontology, Taipei Veterans General Hospital, Taipei, Taiwan.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19410075

Citation

Chen, Yi-Chen, et al. "The Morphologic Characteristics of the Distolingual Roots of Mandibular First Molars in a Taiwanese Population." Journal of Endodontics, vol. 35, no. 5, 2009, pp. 643-5.
Chen YC, Lee YY, Pai SF, et al. The morphologic characteristics of the distolingual roots of mandibular first molars in a Taiwanese population. J Endod. 2009;35(5):643-5.
Chen, Y. C., Lee, Y. Y., Pai, S. F., & Yang, S. F. (2009). The morphologic characteristics of the distolingual roots of mandibular first molars in a Taiwanese population. Journal of Endodontics, 35(5), pp. 643-5. doi:10.1016/j.joen.2009.01.020.
Chen YC, et al. The Morphologic Characteristics of the Distolingual Roots of Mandibular First Molars in a Taiwanese Population. J Endod. 2009;35(5):643-5. PubMed PMID: 19410075.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The morphologic characteristics of the distolingual roots of mandibular first molars in a Taiwanese population. AU - Chen,Yi-Chen, AU - Lee,Ya-Yun, AU - Pai,Sheng-Fang, AU - Yang,Shue-Fen, PY - 2008/11/10/received PY - 2009/01/27/revised PY - 2009/01/28/accepted PY - 2009/5/5/entrez PY - 2009/5/5/pubmed PY - 2009/8/21/medline SP - 643 EP - 5 JF - Journal of endodontics JO - J Endod VL - 35 IS - 5 N2 - INTRODUCTION: The prevalence of extra distolingual (DL) roots in mandibular first molars in Chinese population is about 20%. The purpose of this study was to evaluate the difference of root length and root curvatures between distobuccal (DB) and DL roots of three-rooted mandibular first molars in a Taiwanese (Chinese) population. METHODS: Of the 293 extracted mandibular first molars, DL roots were present in 29 (9.9%) teeth. Excluding teeth with fractured DB or DL roots, 21 mandibular first molars were further investigated. DB and DL root lengths were measured from the lower level of furcation at the distal surface to the root apex. The curvature of the DL root was measured on mesial-distal and buccal-lingual radiographs by Schneider's technique. RESULTS: The DL roots were significantly (p < 0.001) shorter than the DB roots with an average of 1.48 +/- 0.81 mm. Most DL roots had a greater curvature in a buccal-lingual orientation (36.35 degrees +/- 9.38 degrees) than a mesial-distal orientation (9.24 degrees +/- 6.10 degrees) and 28.57% of the curved DL roots had the curvature at the apical one third (p < 0.001). CONCLUSION: The results of this study verified the characteristics of shorter root length and severe buccal-lingual inclination of DL roots in three-rooted mandibular first molars. SN - 1878-3554 UR - https://www.unboundmedicine.com/medline/citation/19410075/The_morphologic_characteristics_of_the_distolingual_roots_of_mandibular_first_molars_in_a_Taiwanese_population_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0099-2399(09)00085-5 DB - PRIME DP - Unbound Medicine ER -